Tools: update BBBmini Device Tree location

Tools/Linux_HAL_Essentials/devicetree/bbbmini/README.md

-#Hardware
-
-## Load device tree
-To load the BBBMINI device tree type `startup.sh load`.
-
-## Build dtbo file
-To rebuild the dtbo file type `make` and than `make install`to copy the dtbo file to `/lib/firmware`.
-
-## Pin assigment
-
-### RCInput
-BBB | RC Receiver | I/O | Remark
------------- | ------------- | ------------- | -------------
-P9.01 DGND | GND | | 
-P9.03 VDD_3V3 | VDD | |
-P8.15 RC_IN | RC Out | IN | 3.3 Volt (Spektrum / PPM-sum) 
-
-### RCOutput
-BBB | ESC / Servo | I/O | Remark
------------- | ------------- | ------------- | -------------
-P8.01 DGND | GND | 
-P8.28 | RC_OUT_CH_1 | OUT | 3.3 Volt
-P8.27 | RC_OUT_CH_2 | OUT | 3.3 Volt
-P8.30 | RC_OUT_CH_3 | OUT | 3.3 Volt
-P8.29 | RC_OUT_CH_4 | OUT | 3.3 Volt
-P8.40 | RC_OUT_CH_5 | OUT | 3.3 Volt
-P8.39 | RC_OUT_CH_6 | OUT | 3.3 Volt
-P8.42 | RC_OUT_CH_7 | OUT | 3.3 Volt
-P8.41 | RC_OUT_CH_8 | OUT | 3.3 Volt
-P8.44 | RC_OUT_CH_9 | OUT | 3.3 Volt
-P8.43 | RC_OUT_CH_10 | OUT | 3.3 Volt
-P8.46 | RC_OUT_CH_11 | OUT | 3.3 Volt
-P8.45 | RC_OUT_CH_12 | OUT | 3.3 Volt
-
-### IMU MPU-9250
-BBB | MPU-9250 | I/O | Remark
------------- | ------------- | ------------- | -------------
-P9.01 DGND | GND | |
-P9.03 VDD_3V3 | VDD | |
-P9.28 MPU9250_CS | MPU9250_CS | OUT | 3.3 Volt
-P9.29 SPI1_MISO | MISO / SD0 | IN | 3.3 Volt
-P9.30 SPI1_MOSI | MOSI / SD1 | OUT | 3.3 Volt
-P9.31 SPI1_SCLK | SCLK / SCL | OUT | 3.3 Volt
-
-
-### Baro MS 5611
-BBB | MS 5611 | I/O | Remark
------------- | ------------- | ------------- | -------------
-P9.01 DGND | GND | |
-P9.03 VDD_3V3 | VDD | |
-P9.29 SPI1_MISO | MISO / SDO | IN | 3.3 Volt
-P9.30 SPI1_MOSI | MOSI / SD1 | OUT | 3.3 Volt
-P9.31 SPI1_SCLK | SCLK / SCL | OUT | 3.3 Volt
-P9.42 MS5611_CS | MS5611_CS | OUT | 3.3 Volt
-
-
-### UART4 MAVLink radio module
-Baudrate 57600, 8, n, 1
-
-BBB | Radio | I/O | Remark
------------- | ------------- | ------------- | -------------
-P9.01 DGND | GND | 
-P9.13 TX | RADIO_RX | OUT | 3.3 Volt 
-P9.11 RX | RADIO_TX | IN | 3.3 Volt
-
-
-### UART5 GPS
-Baudrate 38400, 8, n, 1
-
-BBB | GPS | I/O | Remark
------------- | ------------- | ------------- | -------------
-P8.01 DGND | GND | 
-P8.37 TX | GPS_RX | OUT | 3.3 Volt 
-P8.38 RX | GPS_TX | IN | 3.3 Volt
-
-
-### CAN1 UAVCAN
-You have to use a CAN transceiver (e.g. MCP 2562-E/P) for CAN datatransfer.
-
-BBB | I/O | Remark
------------- | ------------- | -------------
-P9.24 RX | IN | 3.3 Volt 
-P9.26 TX | OUT | 3.3 Volt
-
-### Sound (PWM)
-
-BBB | Speaker | Remark
------------- | ------------- | ------------- 
-P8.36 | PWM | Use a power amplifier
+BBBmini Device Tree files are part of the [dtb-rebuilder](https://github.com/RobertCNelson/dtb-rebuilder) repository and included in the BeagleBone Debian images.